Malicious PDF — malware analysis report

Static analysis result for SHA-256 266a30916285ac33…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 16:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7610a6ac24ed9659e31b43af52526318 SHA-1: 1321b9bea3591d3f3070f996f19c00c2720f3bd6 SHA-256: 266a30916285ac3319434ff65b1baf7d68969001001cc567f0afb7414d6a2ac6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The document also contains numerous links to potentially compromised websites, suggesting it may be part of a link farm used to distribute further malicious content or host phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://giorgiosantinelli.it/file/gefapedawote.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bgkuumjnscpdi40p5tn54qg6p8/vafozemerokup.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210902084827.pdfIn PDF document text
    • http://erpos.sk/data/files/gapum.pdfIn PDF document text
    • http://surestegc.org/documentos/file/47117715347.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985ca9ab9---54404805922.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/xegonudajabekegikajutebe.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/jesezomibipirerizimixuz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c91dc0ea5---42020051695.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/30689352209.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jenorafuxazaroga.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/22616819644.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/67556944024.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/82251001415.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391507df5dd---mowojavute.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/40047584095.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/81778f7dc21b44f8b6767595e29fe5f4/rumutowu.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/bovesajidixofebox.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85200be56---rurijafa.pdfIn PDF document text
    • http://holzbau-napetschnig.at/lejulajewatof.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lizelar.pdfIn PDF document text
    • http://gapp.fr/medias/files/23257420423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+create+email+account+on+my+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 10764 bytes
SHA-256: 3eb1761e42a9e7d130cd8c4eeade92e8b9d797ff4f2a7736d17684c1954a34ab
font_02_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 17644 bytes
SHA-256: 521b30dfcb31a8cbb4b1795693c827989eb665d2d054426c5d44328bc48b0c5f

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